Malicious PDF — malware analysis report

Static analysis result for SHA-256 cedb9154a33b5a8a…

MALICIOUS

PDF

101.9 KB Created: 2021-07-01 10:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f19c89686da7f9d4c852c69e1dfae2d5 SHA-1: ebb031baee6d15846c18d3aeae04b51634fb6b20 SHA-256: cedb9154a33b5a8a31141aaedde7f2431a9fc24b2cea81ad7580c2763a0061d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to lure users to malicious content. The PDF structure itself is heavily obfuscated, and the document body is unreadable, suggesting it's designed to evade static analysis and deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://buka.ru/sadm_files/74128221978.pdf In PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/b9i8g0ieid8kip55ppse75r3ft/jopebu.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074b3125375f---xazuv.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6d697e9c1d2c83f01e0175c0d6b4b446/8188351614.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8d8317b00---zajugopovaruderofi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/be0b3f5a49e8f08e5585e6a6fc91e733/pumapulaxezoxejekozixi.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/wefutapig.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/743d1f91a51d4edf03772b7c326f1d4c/wagozupoxi.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/55761511592.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3af23e771---92480439294.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd51fbe2c02---34646250248.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/elhlcfnspnjc20esbcl2dcc6d5/13152976185.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c53913d6773---vekoge.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1413660ca---direvujowodarupuxewe.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/vuniwupanamibenux.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/jobikeloxorabo.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/lhnc0pgegjtrf3181a5pg1ua2k/37061228468.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/26d28bd3d36353320ed75d522f0ad7ec/geleviwotabese.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/4f0b59cf70d74ed8890f8a62047dada5/2641173829.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/4450239324.pdfIn PDF document text
    • http://klpa.net/userData/board/file/20469465641.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/lalfbdguukl00c84d8fgk4hb27/dafutiriwete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=coconut+is+drupePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000129b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B5 18200 bytes
SHA-256: f1dbe8b1a3dd660b46a07c1027fa0cd9c8a2d1c893112d4d433961fc84585b02
font_01_sfnt_off0001597b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1597B 10432 bytes
SHA-256: 72345792c3fb00e3043fa9427ff177dbf86f01c31d1ff3aa2fc0abd09fe891f4
font_02_sfnt_off00017146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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